Adjust height on long press.

main.dart

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Text Field Focus',
      home: ListView(
        children:[
          MeetingCard(),
          MeetingCard(),          
          MeetingCard(),
          MeetingCard(),
        ]
      ),
    );
  }
}

// Define a custom Form widget.
class MeetingCard extends StatefulWidget {
  @override
  _MeetingCardState createState() => _MeetingCardState();
}

// Define a corresponding State class.
// This class holds data related to the form.
class _MeetingCardState extends State<MeetingCard> {
  double height = 130;

  @override
  Widget build(context) {
    return GestureDetector(
      onLongPress: (){
        setState((){
          height = height == 130 ? 150 : 130;
        });
      },
      child: AnimatedContainer(
        duration: new Duration(milliseconds: 500),
        height: height,
        child: Card(child: Center(child: Text('hello'),),),
      ),
    );
  }
}